Implement basic USB device enumeration on Android.

device/usb/android/java/src/org/chromium/device/usb/ChromeUsbInterface.java

Index: device/usb/android/java/src/org/chromium/device/usb/ChromeUsbInterface.java
diff --git a/device/usb/android/java/src/org/chromium/device/usb/ChromeUsbInterface.java b/device/usb/android/java/src/org/chromium/device/usb/ChromeUsbInterface.java
new file mode 100644
index 0000000000000000000000000000000000000000..cd4f49270edead7572e387577e17edf090c1dab9
--- /dev/null
+++ b/device/usb/android/java/src/org/chromium/device/usb/ChromeUsbInterface.java
@@ -0,0 +1,70 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.device.usb;
+
+import android.hardware.usb.UsbEndpoint;
+import android.hardware.usb.UsbInterface;
+
+import org.chromium.base.Log;
+import org.chromium.base.annotations.CalledByNative;
+import org.chromium.base.annotations.JNINamespace;
+
+/**
+ * Exposes android.hardware.usb.UsbInterface as necessary for C++
+ * device::UsbInterfaceAndroid.
+ *
+ * Lifetime is controlled by device::UsbInterfaceAndroid.
+ */
+@JNINamespace("device")
+final class ChromeUsbInterface {
+    private static final String TAG = "Usb";
+
+    final UsbInterface mInterface;
+
+    private ChromeUsbInterface(UsbInterface iface) {
+        mInterface = iface;
+        Log.v(TAG, "ChromeUsbInterface created.");
+    }
+
+    @CalledByNative
+    private static ChromeUsbInterface create(UsbInterface iface) {
+        return new ChromeUsbInterface(iface);
+    }
+
+    @CalledByNative
+    private int getInterfaceNumber() {
+        return mInterface.getId();
+    }
+
+    @CalledByNative
+    private int getAlternateSetting() {
+        return mInterface.getAlternateSetting();
+    }
+
+    @CalledByNative
+    private int getInterfaceClass() {
+        return mInterface.getInterfaceClass();
+    }
+
+    @CalledByNative
+    private int getInterfaceSubclass() {
+        return mInterface.getInterfaceSubclass();
+    }
+
+    @CalledByNative
+    private int getInterfaceProtocol() {
+        return mInterface.getInterfaceProtocol();
+    }
+
+    @CalledByNative
+    private UsbEndpoint[] getEndpoints() {
+        int count = mInterface.getEndpointCount();
+        UsbEndpoint[] endpoints = new UsbEndpoint[count];
+        for (int i = 0; i < count; ++i) {
+            endpoints[i] = mInterface.getEndpoint(i);
+        }
+        return endpoints;
+    }
+}